Gee, that would be impressive if there weren't so vastly, many more than a billion devices using the 3.5mm jack efficiently and reliably (including the majority of the items you mention above with lightning connectors).
Lightning is just the latest proprietary connector Apple will abandon in the near future, after they've sucked all the profit out of it. Where are all those 30-pin enthusiasts? They sold 300+ Million of those (you're not counting those in that "billion" iDevices are you?).
"Maker of the most 'popular' headphones in the world" (most of which use a 3.5mm jack, by the way), well maybe, but most of those came in the box as a cheap accessory, not something people went out of their way to actually buy (I've got at least a few pairs I just threw in a drawer when they showed up). I'm sure somebody has actually bought a replacement pair, I just don't know anyone who has. Chevy used to sell the most cars in the world, who cares? Let me know when the maker of the "best" headphones in the world (or even a maker that charges more than $20), decides they have to throw a lightning connector in the box, to meet the overwhelming demand.
I'll be listening for that announcement on my 3.5mm headphones, so I can probably only wait for a couple of decades or so to hear the news, still that'll be long after all those recently purchased "Magical" Bluetooth earbud's and their dead batteries have been lost or forgotten.
You know you've jumped the shark when you are trying to convince yourself that a billion lightning connected devices, and no that doesn't include 30 pin devices, is not a significant number. The beauty is you can, thanks to Apple's free adapter, You can put on your 3.5 mm headphones, turn the volume on high and close your eyes while you imagine a world where the 3.5 plug will always be king, along with floppy drives, and cd rom drives and Ethernet ports. The over 200 million, yes, let that sink in, people who buy the iPhone 7 this coming year will be moving on to the wonderful world of Apple wireless and Lightning.